Add test case for issue #25.

test/unit.cpp

@@ -250,6 +250,14 @@ TEST_CASE( "implicit conversion to first type in variant type list", "[variant][
     REQUIRE_THROWS(var.get<double>());
 }
 
+// test case to help debugging https://github.com/mapbox/variant/issues/25
+TEST_CASE( "implicit conversion to unsigned char", "[variant][implicit conversion]" ) {
+    typedef util::variant<unsigned char> variant_type;
+    variant_type var = 500.0; // converted to unsigned char, even if it doesn't fit
+    CHECK(var.get<unsigned char>() == static_cast<unsigned char>(500.0));
+    CHECK(var.get<unsigned char>() == static_cast<unsigned char>(static_cast<unsigned int>(500.0)));
+}
+
 struct dummy {};
 
 TEST_CASE( "implicit conversion to first type it can convert to even if it doesn't fit", "[variant][implicit conversion]" ) {